SoFlo Resident here, there are loads of shark charters but every year it seems to rotate which ones are "hot" or seem to be getting all the Action. Last year that was 100% Salty Divers in Jupiter, but this year a newer outfit Gung -ho is getting all the tigers, apparently four at a time. I haven't paid attention to why these boats have rotating effectiveness but its just a note from the volume of images I see. Both of these boats cater for photographers.
There are three blackwater operators in the area and they take turns on which night of the week they run, its not every night. South Florida Diving Headquarters- Boynton Beach traditionally does Wednesday, Fridays, Pura Vida Does Thursday, Sundays, and Walkers does Mon-Wed-Friday (depending on weather). All three operators are good and everyone uses all three.
Lastly Blue Heron Bridge is a gem in February, obviously stay on top of the daily shifting tide situation, As a visitor I suggest you dont deviate from it. The last two years Februarys were the tail end of Seahorse Season and the start of hairy frogfish season, not to mention the winter nudis are out. If you like the muck, you cant skip it!
As a visitor you will be told to go to crystal river for the manatees over and over. This is not the most idea photography spot for manatees but I suggest you connect with a local guide who can take you to better spots. These are not to be spoken about or shared on open forums lest they become a zoo, but some of them are now burned enough to take tourists, before becoming a circus like crystal river.